Ice-feeling traceless composite fabric and preparation method thereof

Abstract

The invention relates to the technical field of textile, and discloses an ice-feeling traceless composite fabric and a preparation method thereof.The ice-feeling traceless composite fabric is integrally formed by a surface layer, a middle functional layer and a bottom layer through a hot melting composite technology, the surface layer is plain cloth woven by modified polyester superfine fibers, the monofilament fineness of the modified polyester superfine fibers is 0.5-1.2 dtex, the middle functional layer is a polyester fiber, and the bottom layer is a polyester fiber. The warp density of the plain cloth is 320-380 pieces per 10 cm, and the weft density of the plain cloth is 280-340 pieces per 10 cm; the middle functional layer is a nano silicon dioxide modified polyurethane elastic film, and the film thickness is 8-15 microns; and the bottom layer is a knitted fabric formed by blending bamboo pulp fibers and viscose fibers. Through reasonable material selection of the surface layer, the middle functional layer and the bottom layer and an integrated hot melting composite molding design, the synergistic effect of all the layers enables the fabric to have lasting ice feeling experience, traceless fitting effect and good mechanical property, meanwhile, the hydrophilic property of the fabric is further optimized through hydrophilic treatment, muggy and sticky feeling is avoided when the fabric is worn, and the fabric is comfortable to wear. The comprehensive requirements of underwear on comfort, functionality and attractiveness are met.

Description

Technical Field

[0001] This invention relates to the field of textile technology, specifically to an ice-feel seamless composite fabric and its preparation method. Background Technology

[0002] With the improvement of people's living standards and the upgrading of consumption demands, the requirements for comfort and functionality in products such as underwear and sportswear are increasing. Cooling fabrics, which can quickly conduct heat and bring a cool touch when in contact with the skin, have become a research and development hotspot in the fabric field. Seamless design can avoid the problems of skin friction and marks caused by seams of traditional fabrics, further improving the wearing experience. At present, most existing cooling fabrics achieve their cooling effect by adding cooling additives to fibers or by using cooling finishing agents. However, these fabrics have problems such as poor cooling durability and easy shedding of additives. In addition, some cooling fabrics sacrifice the elasticity and breathability of the fabric in pursuit of cooling effect, resulting in a feeling of restriction or stuffiness when wearing them. At the same time, most existing seamless fabrics rely on single fiber weaving or simple composite processes. Composite fabrics often have defects such as weak interlayer bonding and easy delamination and wrinkling. Moreover, most composite fabrics cannot simultaneously achieve multiple properties such as cooling, seamlessness, skin-friendliness, and durability. They either have insufficient cooling effect or poor fit, and also have problems such as weak mechanical properties and easy damage and deformation. In addition, some existing composite fabric manufacturing processes use solvent-based adhesives for bonding, which may leave harmful substances that affect the safety of wearing the fabric and also pollute the environment. Conventional hot melt bonding processes often make it difficult to accurately control the balance between the bonding strength of each layer and the feel of the fabric, which can easily lead to stiffness and reduced elasticity of the fabric, failing to meet consumers' demand for high-quality, multi-functional composite fabrics.

[0003] To address these issues, those skilled in the art have proposed an ice-feeling seamless composite fabric and its preparation method. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an ice-feel seamless composite fabric and its preparation method, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an ice-feel seamless composite fabric, comprising a surface layer, a middle functional layer, and a bottom layer integrally formed by a hot-melt composite process. The surface layer is a plain weave fabric woven from modified polyester microfiber, with a single filament fineness of 0.5-1.2 dtex and a warp density of 320-380 threads / 10cm and a weft density of 280-340 threads / 10cm. The middle functional layer is a nano-silica modified polyurethane elastic film with a film thickness of 8-15 μm. The bottom layer is a knitted fabric blended from bamboo pulp fiber and viscose fiber, with a blending mass ratio of bamboo pulp fiber to viscose fiber of 3:2-2:3 and a weight of 80-120 g / m². 2 The composite basis weight of the surface layer, intermediate functional layer, and bottom layer is 220–280 g / m³. 2 The composite fabric has a cooling sensation value of ≥0.25 W / (cm²). 2 •K), fracture stress ≥450N in the longitudinal direction and ≥380N in the latitudinal direction.

[0006] Preferably, the modified polyester microfiber is made by blending polyester chips with polyethylene glycol and nano-boron nitride, wherein the mass ratio of polyester chips, polyethylene glycol and nano-boron nitride is 90:7:3-85:10:5, the number average molecular weight of polyethylene glycol is 2000-4000, and the particle size of nano-boron nitride is 50-100nm.

[0007] Preferably, the raw materials for preparing the nano-silica modified polyurethane elastic film include polyurethane resin, nano-silica, polysiloxane coupling agent and chain extender, with the mass ratio of each raw material being 100:8:3:5-100:12:5:8. The particle size of the nano-silica is 20-50 nm, the polysiloxane coupling agent is γ-aminopropyltriethoxysilane, and the chain extender is 1,4-butanediol.

[0008] Preferably, the bottom knitted fabric is woven on a 16-needle / 25.4mm knitting machine, the knitting structure is a double-sided plain knit structure, the warp elastic recovery rate of the knitted fabric is ≥92%, the weft elastic recovery rate is ≥90%, and the air permeability is 800~1200mm / s.

[0009] Preferably, the surface plain weave fabric is hydrophilic treated with a polyether-modified silicone as the treatment agent. The amount of the treatment agent applied is 3% to 5% of the surface weight, and the hydrophilic angle of the surface after treatment is ≤35°.

[0010] A method for preparing an ice-feel seamless composite fabric includes the following steps: Step 1: Surface preparation. Polyester chips, polyethylene glycol, and nano boron nitride are dried and mixed evenly. Modified polyester microfiber is obtained by melt spinning. The modified polyester microfiber is warped and sized and then woven into plain fabric using an air-jet loom. After weaving, it is desized, pre-shrinked, and hydrophilic treated to obtain the surface layer. Step 2: Preparation of intermediate functional layer. Polyurethane resin, nano silica, polysiloxane coupling agent and chain extender are mixed and stirred at 80-90℃ for 60-90 min to obtain a mixed slurry. The mixed slurry is then used to form a nano silica modified polyurethane elastic film by a casting film forming process. The film thickness is controlled to be 8-15 μm to obtain the intermediate functional layer. Step 3: Bottom layer preparation. Bamboo pulp fiber and viscose fiber are mixed in a set mass ratio and processed through opening and cleaning, carding, drawing, roving, spinning and winding to obtain blended yarn. The blended yarn is then woven into a double-sided plain knit fabric using a knitting machine. After weaving, the fabric is pre-shrinked and set to obtain the bottom layer. Step 4: Composite molding. Hot melt adhesive is applied to both sides of the intermediate functional layer. The amount of hot melt adhesive applied is 15-25 g / m². 2 The surface layer, the glued intermediate functional layer, and the bottom layer are stacked in sequence and fed into a laminating machine. They are then hot-melt laminated under conditions of 120-140℃, 0.3-0.5MPa, and 5-8m / min. After lamination, the fabric is cooled, trimmed, and inspected to obtain the ice-feel seamless composite fabric.

[0011] Preferably, the process parameters for melt spinning in step 1 are: spinning temperature 260-275℃, spinneret orifice diameter 0.15-0.25mm, cooling air velocity 0.8-1.2m / s, cooling temperature 20-25℃, draw ratio 3.5-4.5 times, and winding speed 800-1000m / min.

[0012] Preferably, the hydrophilic treatment process conditions in step 1 are: treatment solution temperature 40-50℃, treatment time 20-30min, bath ratio 1:20-1:30, and drying at 100-110℃ for 20-30min after treatment.

[0013] Preferably, the process conditions for the shaping treatment in step 3 are: shaping temperature 130-145℃, shaping time 30-45s, overfeed rate 3%-5%, and natural cooling to room temperature after shaping.

[0014] Preferably, the hot melt adhesive in step 4 is a polyester-type hot melt adhesive with a softening point of 85-100℃ and a melt viscosity of 800-1200 mPa·s at 120℃. The cooling after lamination adopts a segmented cooling method, with the first segment cooling temperature at 80-90℃, the second segment cooling temperature at 40-50℃, and the third segment cooling temperature at 20-25℃, and the cooling time for each segment being 10-15s.

[0015] This invention provides an ice-feel seamless composite fabric and its preparation method. It has the following beneficial effects: 1. This invention utilizes a rational selection of materials for the surface layer, intermediate functional layer, and bottom layer, along with an integrated hot-melt composite molding design. The modified polyester microfiber on the surface layer imparts excellent cooling sensation and smooth feel to the fabric. The intermediate nano-silica modified polyurethane elastic film ensures both the fabric's elasticity recovery and structural stability. The bottom layer, a blended knitted fabric, enhances the fabric's skin-friendliness, breathability, and moisture absorption. The synergistic effect of each layer gives the fabric a lasting cooling sensation, a seamless fit, and good mechanical properties. At the same time, hydrophilic treatment further optimizes the fabric's hydrophilic properties, preventing a stuffy and sticky feeling when worn, thus meeting the comprehensive needs of intimate apparel for comfort, functionality, and aesthetics.

[0016] 2. This invention achieves its goals by precisely controlling the processing technology and composite parameters of each layer of raw materials. The melt spinning process ensures the structural integrity and functional stability of the modified polyester microfiber, while the casting process forms a uniform and dense elastic film structure in the intermediate functional layer. The hot melt composite process ensures a firm bond between the layers while avoiding problems such as stiffness and wrinkling in the fabric. Segmented cooling and targeted shaping further improve the dimensional stability and performance of the fabric. The entire preparation process is coherent and efficient, enabling the stable production of composite fabrics with multiple advantages such as a cooling feel, seamlessness, skin-friendliness, and durability. Moreover, the process is highly controllable and suitable for large-scale industrial production. Attached Figure Description

[0017] Figure 1 This is a flowchart of the preparation method of the present invention. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see the appendix Figure 1 This invention provides an ice-feel seamless composite fabric and its preparation method.

[0020] Example 1 Surface layer: Plain weave fabric made of modified polyester microfiber (polyester chips: polyethylene glycol: nano boron nitride = 90:7:3, polyethylene glycol number average molecular weight 2000, nano boron nitride particle size 50nm), with a single filament fineness of 0.5dtex, warp density of 320 threads / 10cm and weft density of 280 threads / 10cm; treated with polyether-modified silicone hydrophilic treatment, with an application rate of 3% and a hydrophilic angle of 32°.

[0021] Intermediate functional layer: Nano-silica modified polyurethane elastic film (polyurethane resin: nano-silica: γ-aminopropyltriethoxysilane: 1,4-butanediol = 100:8:3:5, nano-silica particle size 20nm), film thickness 8μm.

[0022] Bottom layer: A blend of bamboo pulp fiber and viscose fiber (3:2 by weight) knitted fabric, woven on a 16-gauge / 25.4mm knitting machine in a double-sided plain knit structure, with a weight of 80g / m². 2 It has a warp elastic recovery rate of 93%, a weft elastic recovery rate of 91%, and an air permeability of 850 mm / s.

[0023] Composite process: Polyester hot melt adhesive (softening point 85℃, melt viscosity 800 mPa·s at 120℃), coating amount 15 g / m 2 The combined temperature is 120℃, the pressure is 0.3MPa, and the speed is 5m / min; the cooling is segmented (80℃→40℃→20℃, 10s per segment).

[0024] Composite weight: 220g / m³ 2 .

[0025] Example 2 Surface layer: Plain weave fabric made of modified polyester microfiber (polyester chips: polyethylene glycol: nano boron nitride = 88:8:4, polyethylene glycol number average molecular weight 3000, nano boron nitride particle size 70nm), with a single filament fineness of 0.8dtex, warp density of 350 threads / 10cm, and weft density of 310 threads / 10cm; treated with polyether-modified silicone hydrophilic treatment, with a treatment agent application amount of 4% and a hydrophilic angle of 30°.

[0026] Intermediate functional layer: Nano-silica modified polyurethane elastic film (polyurethane resin: nano-silica: γ-aminopropyltriethoxysilane: 1,4-butanediol = 100:10:4:6, nano-silica particle size 35nm), film thickness 11μm.

[0027] Bottom layer: A blend of bamboo pulp fiber and viscose fiber (1:1 mass ratio) knitted fabric, woven on a 16-gauge / 25.4mm knitting machine in a double-sided plain knit structure, with a weight of 100g / m². 2 It has a warp elastic recovery rate of 94%, a weft elastic recovery rate of 92%, and an air permeability of 1000 mm / s.

[0028] Composite process: Polyester hot melt adhesive (softening point 92℃, melt viscosity 1000mPa・s at 120℃), coating amount 20g / m 2 The combined temperature is 130℃, the pressure is 0.4MPa, and the speed is 6.5m / min; the cooling is segmented (85℃→45℃→22℃, 12s per segment).

[0029] Composite weight: 250g / m³ 2 .

[0030] Example 3 Surface layer: Plain weave fabric made of modified polyester microfiber (polyester chips: polyethylene glycol: nano boron nitride = 85:10:5, polyethylene glycol number average molecular weight 4000, nano boron nitride particle size 100nm), with a single filament fineness of 1.2dtex, warp density of 380 threads / 10cm, and weft density of 340 threads / 10cm; treated with polyether-modified silicone hydrophilic treatment, with an application rate of 5% and a hydrophilic angle of 28°.

[0031] Intermediate functional layer: Nano-silica modified polyurethane elastic film (polyurethane resin: nano-silica: γ-aminopropyltriethoxysilane: 1,4-butanediol = 100:12:5:8, nano-silica particle size 50nm), film thickness 15μm.

[0032] Bottom layer: A blend of bamboo pulp fiber and viscose fiber (2:3 by weight) knitted fabric, woven on a 16-gauge / 25.4mm knitting machine in a double-sided plain knit structure, with a weight of 120g / m². 2 It has a warp elastic recovery rate of 95%, a weft elastic recovery rate of 93%, and an air permeability of 1150 mm / s.

[0033] Composite process: Polyester hot melt adhesive (softening point 100℃, melt viscosity 1200 mPa·s at 120℃), coating amount 25 g / m 2 The combined temperature is 140℃, the pressure is 0.5MPa, and the speed is 8m / min; segmented cooling (90℃→50℃→25℃, 15s per segment).

[0034] Composite weight: 280g / m³ 2 .

[0035] Example 4 Surface layer: Plain weave fabric made of modified polyester microfiber (polyester chips: polyethylene glycol: nano boron nitride = 87:9:4, polyethylene glycol number average molecular weight 3500, nano boron nitride particle size 80nm), with a single filament fineness of 0.7dtex, warp density of 340 threads / 10cm, and weft density of 300 threads / 10cm; treated with polyether-modified silicone hydrophilic treatment, with an application rate of 3.5% and a hydrophilic angle of 31°.

[0036] Intermediate functional layer: Nano-silica modified polyurethane elastic film (polyurethane resin: nano-silica: γ-aminopropyltriethoxysilane: 1,4-butanediol = 100:9:3.5:7, nano-silica particle size 30nm), film thickness 10μm.

[0037] Bottom layer: A blend of bamboo pulp fiber and viscose fiber (3:2 by weight) knitted fabric, woven on a 16-gauge / 25.4mm knitting machine in a double-sided plain knit structure, with a weight of 90g / m². 2 It has a warp elastic recovery rate of 93%, a weft elastic recovery rate of 91%, and an air permeability of 950 mm / s.

[0038] Composite process: Polyester hot melt adhesive (softening point 90℃, melt viscosity 900 mPa·s at 120℃), coating amount 18 g / m 2 The combined temperature is 125℃, the pressure is 0.35MPa, and the speed is 6m / min; the cooling is segmented (82℃→42℃→21℃, 11s per segment).

[0039] Composite weight: 235g / m³ 2 .

[0040] Example 5 Surface layer: Plain weave fabric made of modified polyester microfiber (polyester chips: polyethylene glycol: nano boron nitride = 86:9:5, polyethylene glycol number average molecular weight 2500, nano boron nitride particle size 60nm), with a single filament fineness of 1.0dtex, warp density of 360 threads / 10cm, and weft density of 320 threads / 10cm; treated with polyether-modified silicone hydrophilic treatment, with an application rate of 4.5% and a hydrophilic angle of 29°.

[0041] Intermediate functional layer: Nano-silica modified polyurethane elastic film (polyurethane resin: nano-silica: γ-aminopropyltriethoxysilane: 1,4-butanediol = 100:11:4.5:7.5, nano-silica particle size 40nm), film thickness 13μm.

[0042] Bottom layer: A blend of bamboo pulp fiber and viscose fiber (2:3 by weight) knitted fabric, woven on a 16-gauge / 25.4mm knitting machine in a double-sided plain knit structure, with a weight of 110g / m². 2 It has a warp elastic recovery rate of 94%, a weft elastic recovery rate of 92%, and an air permeability of 1050 mm / s.

[0043] Composite process: Polyester hot melt adhesive (softening point 95℃, melt viscosity 1100 mPa·s at 120℃), coating amount 22 g / m 2 The combined temperature is 135℃, the pressure is 0.45MPa, and the speed is 7m / min; the cooling is segmented (88℃→48℃→24℃, 13s per segment).

[0044] Composite weight: 265g / m³ 2 .

[0045] II. Comparative Examples (5 examples) Comparative Example 1 (Surface fibers without nano-boron nitride modification) Surface layer: a plain weave fabric made of microfiber woven from polyester chips and polyethylene glycol blended and spun (mass ratio 97:3), with other surface layer parameters consistent with those in Example 2.

[0046] The intermediate functional layer, the bottom layer, and the composite process are completely consistent with those in Example 2.

[0047] Comparative Example 2 (intermediate layer is unmodified polyurethane elastic film) Intermediate functional layer: pure polyurethane elastic film (without nano silica and polysiloxane coupling agent), film thickness 11μm.

[0048] The surface layer, bottom layer, and composite process are completely consistent with those in Example 2.

[0049] Comparative Example 3 (bottom layer is a single viscose fiber knitted fabric) Bottom layer: Pure viscose fiber knitted fabric (no bamboo pulp fiber), weight 100g / m² 2 The remaining underlying parameters are the same as in Example 2.

[0050] The surface layer, intermediate functional layer, and composite process are completely consistent with those in Example 2.

[0051] Comparative Example 4 (using solvent-based adhesives) Composite process: Replaced with solvent-based polyurethane adhesive (coating amount 20g / m²) 2 The combined temperature is 80℃, the pressure is 0.4MPa, the speed is 4m / min, and there is no segmented cooling.

[0052] The surface layer, intermediate functional layer, and bottom layer are completely identical to those in Example 2.

[0053] Comparative Example 5 (without hydrophilic treatment) Surface layer: No polyether-modified silicone hydrophilic treatment was performed; other surface parameters were the same as in Example 2.

[0054] The intermediate functional layer, the bottom layer, and the composite process are completely consistent with those in Example 2.

[0055] The test results are shown in Table 1 below: Test Project Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 <![CDATA[Cool touch value [W / (cm 2 ·K)]]]> 0.26 0.28 0.29 0.27 0.28 0.18 0.26 0.27 0.26 0.27 Fracture strength - radial [N] 455 480 510 465 495 440 420 470 430 475 Fracture strength - latitudinal [N] 385 410 435 395 420 370 350 400 360 405 Elastic recovery rate – warp [%] 93 94 95 93 94 92 88 93 90 94 Elastic recovery rate – weft direction [%] 91 92 93 91 92 90 86 91 88 92 Air permeability [mm / s] 840 990 1140 940 1040 980 970 820 950 980 Hydrophilic angle [°] 32 30 28 31 29 30 30 30 30 65 Interlaminar peel strength [N / 2cm] 4.2 4.8 5.3 4.4 5.0 4.7 3.2 4.6 3.5 4.7 Cooling sensation when wearing the garment (1-5 points) 4.2 4.6 4.8 4.3 4.7 3.0 4.1 4.3 4.0 4.2 Seamless fit (1-5 points) 4.3 4.7 4.9 4.4 4.8 4.2 3.5 4.3 3.8 4.4 Table 1 (Performance Test Results and Comparison Table) As shown in Table 1: Cooling sensation upon contact: Comparative Example 1, due to the absence of nano-boron nitride added to the surface fibers, had a cooling sensation value of only 0.18 W / (cm²). 2 • K), significantly lower than ≥0.26 W / (cm) in each embodiment. 2 •K)) demonstrates that the synergistic modification of nano-boron nitride and polyethylene glycol can significantly improve the cooling performance of fabrics; the cooling value of each embodiment meets the requirement of ≥0.25W / (cm) 2The product meets the requirements of K) and has a cooling sensation rating of ≥4.2 points, which is better than the comparison ratio.

[0056] Mechanical properties and elasticity: In Comparative Example 2, the intermediate functional layer was not modified with nano-silica, resulting in a significant decrease in fracture stress, elastic recovery rate, and interlayer peel strength. The warp elastic recovery rate was only 88%, and the interlayer peel strength was only 3.2 N / 2 cm. In contrast, the examples maintained excellent mechanical properties and elasticity, with a warp elastic recovery rate ≥93% and an interlayer peel strength ≥4.2 N / 2 cm, ensuring the fabric's durability and seamless bonding effect.

[0057] Skin-friendly and breathable: Comparative Example 3 uses a single viscose fiber bottom layer, and the air permeability is reduced to 820mm / s, which is lower than 990mm / s in Example 2, indicating that the blending of bamboo pulp fiber and viscose fiber can optimize the breathability. Comparative Example 5 was not treated with hydrophilicity, and the hydrophilicity angle reached 65°, which is much higher than ≤32° in the Example. It is easy to produce a sticky feeling when wearing it. In contrast, the Example has excellent hydrophilicity, which improves the skin-friendly comfort.

[0058] Composite stability: Comparative Example 4 uses solvent-based adhesives for composite bonding, with an interlayer peel strength of only 3.5 N / 2 cm and a seamless fit score of 3.8 points, which are lower than 4.8 N / 2 cm and 4.7 points of Example 2. Moreover, solvent-based processes may leave harmful substances. In contrast, the hot-melt composite process of this invention, combined with segmented cooling, not only ensures a strong interlayer bond but also improves the fit of the garment and is more environmentally friendly.

[0059] Overall performance: All embodiments demonstrate excellent performance in terms of coolness upon contact, mechanical strength, elastic recovery, breathability and hydrophilicity, interlayer bonding, and wearing experience, with each performance synergistically balanced. In contrast, the comparative embodiments, lacking key component modification or optimization processes, all exhibit shortcomings in one or more performance aspects. This proves that the present invention achieves a synergistic enhancement of multiple fabric functions through the rational selection of materials and optimization of the preparation process for the surface layer, intermediate functional layer, and bottom layer, demonstrating significant technical advantages.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seamless, ice-feeling composite fabric, characterized in that, The fabric is integrally formed from a surface layer, a middle functional layer, and a bottom layer through a hot-melt composite process. The surface layer is a plain weave fabric woven from modified polyester microfiber, with a single filament fineness of 0.5-1.2 dtex. The warp density of the plain weave fabric is 320-380 threads / 10cm, and the weft density is 280-340 threads / 10cm. The middle functional layer is a nano-silica modified polyurethane elastic film with a film thickness of 8-15μm. The bottom layer is a knitted fabric blended from bamboo pulp fiber and viscose fiber, with a blending mass ratio of bamboo pulp fiber to viscose fiber of 3:2-2:

3. The weight of the knitted fabric is 80-120 g / m². 2 The composite basis weight of the surface layer, intermediate functional layer, and bottom layer is 220–280 g / m³. 2 The composite fabric has a cooling sensation value of ≥0.25 W / (cm²). 2 •K), fracture stress ≥450N in the longitudinal direction and ≥380N in the latitudinal direction.

2. The ice-feel seamless composite fabric according to claim 1, characterized in that, The modified polyester microfiber is made by blending polyester chips with polyethylene glycol and nano-boron nitride. The mass ratio of polyester chips, polyethylene glycol and nano-boron nitride is 90:7:3-85:10:

5. The number average molecular weight of polyethylene glycol is 2000-4000 and the particle size of nano-boron nitride is 50-100nm.

3. The ice-feel seamless composite fabric according to claim 1, characterized in that, The raw materials for preparing the nano-silica modified polyurethane elastic film include polyurethane resin, nano-silica, polysiloxane coupling agent and chain extender, with a mass ratio of 100:8:3:5-100:12:5:

8. The particle size of the nano-silica is 20-50 nm, the polysiloxane coupling agent is γ-aminopropyltriethoxysilane, and the chain extender is 1,4-butanediol.

4. The ice-feel seamless composite fabric according to claim 1, characterized in that, The bottom knitted fabric is woven on a 16-needle / 25.4mm knitting machine with a double-sided plain knit structure. The warp elastic recovery rate of the knitted fabric is ≥92%, the weft elastic recovery rate is ≥90%, and the air permeability is 800~1200mm / s.

5. The ice-feel seamless composite fabric according to claim 1, characterized in that, The surface plain weave fabric is hydrophilic treated with a polyether-modified silicone as the treatment agent. The amount of the treatment agent applied is 3% to 5% of the surface weight, and the hydrophilic angle of the surface after treatment is ≤35°.

6. A method for preparing an ice-feel seamless composite fabric, comprising the ice-feel seamless composite fabric according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Surface preparation. Polyester chips, polyethylene glycol, and nano boron nitride are dried and mixed evenly. Modified polyester microfiber is obtained by melt spinning. The modified polyester microfiber is warped and sized and then woven into plain fabric using an air-jet loom. After weaving, it is desized, pre-shrinked, and hydrophilic treated to obtain the surface layer. Step 2: Preparation of intermediate functional layer. Polyurethane resin, nano silica, polysiloxane coupling agent and chain extender are mixed and stirred at 80-90℃ for 60-90 min to obtain a mixed slurry. The mixed slurry is then used to form a nano silica modified polyurethane elastic film by a casting film forming process. The film thickness is controlled to be 8-15 μm to obtain the intermediate functional layer. Step 3: Bottom layer preparation. Bamboo pulp fiber and viscose fiber are mixed in a set mass ratio and processed through opening and cleaning, carding, drawing, roving, spinning and winding to obtain blended yarn. The blended yarn is then woven into a double-sided plain knit fabric using a knitting machine. After weaving, the fabric is pre-shrinked and set to obtain the bottom layer. Step 4: Composite molding. Hot melt adhesive is applied to both sides of the intermediate functional layer. The amount of hot melt adhesive applied is 15-25 g / m². 2 The surface layer, the glued intermediate functional layer, and the bottom layer are stacked in sequence and fed into a laminating machine. They are then hot-melt laminated under conditions of 120-140℃, 0.3-0.5MPa, and 5-8m / min. After lamination, the fabric is cooled, trimmed, and inspected to obtain the ice-feel seamless composite fabric.

7. The preparation method according to claim 6, characterized in that, The process parameters for melt spinning in step 1 are as follows: spinning temperature 260-275℃, spinneret orifice diameter 0.15-0.25mm, cooling air velocity 0.8-1.2m / s, cooling temperature 20-25℃, draw ratio 3.5-4.5 times, and winding speed 800-1000m / min.

8. The preparation method according to claim 6, characterized in that, The hydrophilic treatment process conditions in step 1 are as follows: treatment solution temperature 40-50℃, treatment time 20-30min, bath ratio 1:20-1:30, and drying at 100-110℃ for 20-30min after treatment.

9. The preparation method according to claim 6, characterized in that, The process conditions for the shaping treatment in step 3 are as follows: shaping temperature 130-145℃, shaping time 30-45s, overfeed rate 3%-5%, and natural cooling to room temperature after shaping.

10. The preparation method according to claim 6, characterized in that, In step 4, the hot melt adhesive is a polyester-based hot melt adhesive with a softening point of 85-100℃ and a melt viscosity of 800-1200 mPa·s at 120℃. The cooling after lamination adopts a segmented cooling method, with the first segment cooling temperature at 80-90℃, the second segment cooling temperature at 40-50℃, and the third segment cooling temperature at 20-25℃, and the cooling time for each segment being 10-15 seconds.

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